drivers/net/irda/irda-usb.h

   1 /*****************************************************************************
   2  *
   3  * Filename:      irda-usb.h
   4  * Version:       0.9b
   5  * Description:   IrDA-USB Driver
   6  * Status:        Experimental
   7  * Author:        Dag Brattli <dag@brattli.net>
   8  *
   9  *      Copyright (C) 2001, Roman Weissgaerber <weissg@vienna.at>
  10  *      Copyright (C) 2000, Dag Brattli <dag@brattli.net>
  11  *      Copyright (C) 2001, Jean Tourrilhes <jt@hpl.hp.com>
  12  *
  13  *      This program is free software; you can redistribute it and/or modify
  14  *      it under the terms of the GNU General Public License as published by
  15  *      the Free Software Foundation; either version 2 of the License, or
  16  *      (at your option) any later version.
  17  *
  18  *      This program is distributed in the hope that it will be useful,
  19  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *      GNU General Public License for more details.
  22  *
  23  *      You should have received a copy of the GNU General Public License
  24  *      along with this program; if not, write to the Free Software
  25  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  26  *
  27  *****************************************************************************/
  28
  29 #include <linux/time.h>
  30
  31 #include <net/irda/irda.h>
  32 #include <net/irda/irda_device.h>      /* struct irlap_cb */
  33
  34 #define RX_COPY_THRESHOLD 200
  35 #define IRDA_USB_MAX_MTU 2051
  36 #define IRDA_USB_SPEED_MTU 64           /* Weird, but work like this */
  37
  38 /* Maximum number of active URB on the Rx path
  39  * This is the amount of buffers the we keep between the USB harware and the
  40  * IrDA stack.
  41  *
  42  * Note : the network layer does also queue the packets between us and the
  43  * IrDA stack, and is actually pretty fast and efficient in doing that.
  44  * Therefore, we don't need to have a large number of URBs, and we can
  45  * perfectly live happy with only one. We certainly don't need to keep the
  46  * full IrTTP window around here...
  47  * I repeat for those who have trouble to understand : 1 URB is plenty
  48  * good enough to handle back-to-back (brickwalled) frames. I tried it,
  49  * it works (it's the hardware that has trouble doing it).
  50  *
  51  * Having 2 URBs would allow the USB stack to process one URB while we take
  52  * care of the other and then swap the URBs...
  53  * On the other hand, increasing the number of URB will have penalities
  54  * in term of latency and will interact with the link management in IrLAP...
  55  * Jean II */
  56 #define IU_MAX_ACTIVE_RX_URBS   1       /* Don't touch !!! */
  57
  58 /* When a Rx URB is passed back to us, we can't reuse it immediately,
  59  * because it may still be referenced by the USB layer. Therefore we
  60  * need to keep one extra URB in the Rx path.
  61  * Jean II */
  62 #define IU_MAX_RX_URBS  (IU_MAX_ACTIVE_RX_URBS + 1)
  63
  64 /* Various ugly stuff to try to workaround generic problems */
  65 /* Send speed command in case of timeout, just for trying to get things sane */
  66 #define IU_BUG_KICK_TIMEOUT
  67 /* Show the USB class descriptor */
  68 #undef IU_DUMP_CLASS_DESC
  69 /* Assume a minimum round trip latency for USB transfer (in us)...
  70  * USB transfer are done in the next USB slot if there is no traffic
  71  * (1/19 msec) and is done at 12 Mb/s :
  72  * Waiting for slot + tx = (53us + 16us) * 2 = 137us minimum.
  73  * Rx notification will only be done at the end of the USB frame period :
  74  * OHCI : frame period = 1ms
  75  * UHCI : frame period = 1ms, but notification can take 2 or 3 ms :-(
  76  * EHCI : frame period = 125us */
  77 #define IU_USB_MIN_RTT          500     /* This should be safe in most cases */
  78
  79 /* Inbound header */
  80 #define MEDIA_BUSY    0x80
  81
  82 #define SPEED_2400    0x01
  83 #define SPEED_9600    0x02
  84 #define SPEED_19200   0x03
  85 #define SPEED_38400   0x04
  86 #define SPEED_57600   0x05
  87 #define SPEED_115200  0x06
  88 #define SPEED_576000  0x07
  89 #define SPEED_1152000 0x08
  90 #define SPEED_4000000 0x09
  91
  92 /* Basic capabilities */
  93 #define IUC_DEFAULT     0x00    /* Basic device compliant with 1.0 spec */
  94 /* Main bugs */
  95 #define IUC_SPEED_BUG   0x01    /* Device doesn't set speed after the frame */
  96 #define IUC_NO_WINDOW   0x02    /* Device doesn't behave with big Rx window */
  97 #define IUC_NO_TURN     0x04    /* Device doesn't do turnaround by itself */
  98 /* Not currently used */
  99 #define IUC_SIR_ONLY    0x08    /* Device doesn't behave at FIR speeds */
 100 #define IUC_SMALL_PKT   0x10    /* Device doesn't behave with big Rx packets */
 101 #define IUC_MAX_WINDOW  0x20    /* Device underestimate the Rx window */
 102 #define IUC_MAX_XBOFS   0x40    /* Device need more xbofs than advertised */
 103
 104 /* USB class definitions */
 105 #define USB_IRDA_HEADER   0x01
 106 #define USB_CLASS_IRDA    0x02 /* USB_CLASS_APP_SPEC subclass */
 107 #define USB_DT_IRDA       0x21
 108
 109 struct irda_class_desc {
 110         __u8  bLength;
 111         __u8  bDescriptorType;
 112         __u16 bcdSpecRevision;
 113         __u8  bmDataSize;
 114         __u8  bmWindowSize;
 115         __u8  bmMinTurnaroundTime;
 116         __u16 wBaudRate;
 117         __u8  bmAdditionalBOFs;
 118         __u8  bIrdaRateSniff;
 119         __u8  bMaxUnicastList;
 120 } __attribute__ ((packed));
 121
 122 /* class specific interface request to get the IrDA-USB class descriptor
 123  * (6.2.5, USB-IrDA class spec 1.0) */
 124
 125 #define IU_REQ_GET_CLASS_DESC   0x06
 126
 127 struct irda_usb_cb {
 128         struct irda_class_desc *irda_desc;
 129         struct usb_device *usbdev;      /* init: probe_irda */
 130         struct usb_interface *usbintf;  /* init: probe_irda */
 131         int netopen;                    /* Device is active for network */
 132         int present;                    /* Device is present on the bus */
 133         __u32 capability;               /* Capability of the hardware */
 134         __u8  bulk_in_ep;               /* Rx Endpoint assignments */
 135         __u8  bulk_out_ep;              /* Tx Endpoint assignments */
 136         __u16 bulk_out_mtu;             /* Max Tx packet size in bytes */
 137         __u8  bulk_int_ep;              /* Interrupt Endpoint assignments */
 138
 139         wait_queue_head_t wait_q;       /* for timeouts */
 140
 141         struct urb *rx_urb[IU_MAX_RX_URBS];     /* URBs used to receive data frames */
 142         struct urb *idle_rx_urb;        /* Pointer to idle URB in Rx path */
 143         struct urb *tx_urb;             /* URB used to send data frames */
 144         struct urb *speed_urb;          /* URB used to send speed commands */
 145
 146         struct net_device *netdev;      /* Yes! we are some kind of netdev. */
 147         struct net_device_stats stats;
 148         struct irlap_cb   *irlap;       /* The link layer we are binded to */
 149         struct qos_info qos;
 150         hashbin_t *tx_list;             /* Queued transmit skb's */
 151         char *speed_buff;               /* Buffer for speed changes */
 152
 153         struct timeval stamp;
 154         struct timeval now;
 155
 156         spinlock_t lock;                /* For serializing operations */
 157
 158         __u16 xbofs;                    /* Current xbofs setting */
 159         __s16 new_xbofs;                /* xbofs we need to set */
 160         __u32 speed;                    /* Current speed */
 161         __s32 new_speed;                /* speed we need to set */
 162 };
 163